marquardt method

[afgdurrani0]

Can anybody provide me the complete proc of marquardt method?

[ChrisHemedinger]

Without further details, I can guess only that you're looking at nonlinear regression (PROC NLIN) with METHOD=MARQUARDT for the fitting algorithm.  This community can provide much more help if you provide more details on the problem.  There is some basic guidance here in this doc from UCLA.  And some general overview of related procedures here.

Chris

[Rick_SAS]

The Marquardt least-squares optiomization method is available by using the NLPLM subroutine in SAS/IML.  The documentation of the NLPLM subroutine describes the algorithm as "an efficient modification of the trust-region method."

[afgdurrani0]

Dearest sir,

Thank you for your kind reply.

I am a fisheries specialist and frequently use SAS for my statistics problems. In a research paper, I have studied about the modified form of Marquardt method. I want you to have look at this modified method (below link) and kindly provide me your comments and view over this modified form of Marquardt method ; that is it correct? Thanks alot

Program Summary - general model.pdf - Google Drive